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Just line up the decimal point and add zeros where you need them:

3.8 - 1.279

becomes

3.800

1.279

--------

5.218-3

becomes

5.218

3.000

-------

From here, proceed as normal (borrowing, etc.) to find the answer.

Note that I've left out the subtraction sign to make sure numbers align.

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∙ 18y ago

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